Potassium Dichromate

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  • Identifiers

    CAS number
    7778-50-9

    Molecular formula
    Cr2K2O7

    SMILES
    [O-][Cr](=O)(=O)O[Cr](=O)(=O)[O-].[K+].[K+]

    Safety labels

    Oxidizer
    Oxidizer

    Corrosive
    Corrosive

    Acute Toxic
    Acute Toxic

    Health Hazard
    Health

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Odorless 89.75%
    Sour 19.04%
    Clean 15.06%
    Winey 13.14%
    Sharp 12.75%
    Ethereal 12.14%
    Burnt 10.84%
    Pungent 10.14%
    Alcoholic 9.2%
    Bitter 8.85%

     

    Flavor
    Bitter 51.6%
    Odorless 45.58%
    Bland 24.1%
    Very mild 20.51%
    Formyl 19.76%
    Nitrile 19.23%
    Rotten 18.96%
    Urine 18.73%
    Yeast 18.61%
    Mousy 18.06%

     

  • Properties

    pKa est.
    -16.5 (strong acid)

    Molecular weight
    294.18 g/mol

    Melting point expt.

    • 748 °F (NTP, 1992)
    • 398 °C

    Boiling point

    • Decomposes at 932 °F (NTP, 1992)
    • Decomposes at about 500 °C

    Flash point

    • -35.96 ˚C est.

    Solubility expt.

    • 10 to 50 mg/mL at 68 °F (NTP, 1992)
    • In water, 45,000 mg/L at 25 °C
    • Solubility in water: 4.9 g/100 cc at 0 °C; 102 g/100 cc at 100 °C; insoluble in alcohol
    • Saturated aqueous solution contains 4.3% at 0 °C; 11.7% at 20 °C; 20.9% at 40 °C; 50.2% at 100 °C
    • Solubility in water, g/100ml at 20 °C: 12 (moderate)

  • Synonyms

    • POTASSIUM DICHROMATE
    • 7778-50-9
    • Potassium bichromate
    • Kaliumdichromat
    • Iopezite
    • Potassium dichromate(VI)
    • Dipotassium bichromate
    • Dipotassium dichromate
    • Bichromate of potash
    • Dipotassium dichromium heptaoxide
    • Caswell No. 690
    • Dichromic acid dipotassium salt
    • Kalium bichromicum
    • SRM 935a
    • CCRIS 2409
    • Potassium chromate (K2Cr2O7)
    • HSDB 1238
    • Potassium dichromate (K2Cr2O7)
    • K2Cr2O7
    • Potassium dichromate (K2(Cr2O7))
    • EINECS 231-906-6
    • NSC 77372
    • EPA Pesticide Chemical Code 068302
    • UNII-T4423S18FM
    • Dichromic acid, dipotassium salt
    • DTXSID5025948
    • CHEBI:53444
    • Chromium potassium oxide
    • T4423S18FM
    • potassium dichromate(2-)
    • MFCD00011367
    • DTXCID705948
    • EC 231-906-6
    • NSC-77372
    • dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium
    • Kaliumdichromat [German]
    • POTASSIUM DICHROMATE (MART.)
    • POTASSIUM DICHROMATE [MART.]
    • CAS-7778-50-9
    • Bichromate, Potassium
    • Dichromate, Potassium
    • Kali bichromicum
    • BICHROME
    • Kali Bichromicum 6C
    • Kali Bichromicum 30c
    • Kali bichromicum7123
    • Kali bichromicum 200C
    • Potassium dichromate (VI)
    • Epitope ID:119680
    • Chromic acid (H2Cr2O7) potassium salt (1:2)
    • Kali Bichromicum Kit Refill
    • Dipotassium dichromate (VI)
    • KALI BICHROMICUM200ck
    • Pesticide Code: 068302
    • POTASSIUM DICHROMATE VI
    • Potassium dichromate ACS grade
    • KALI BICHROMICUM [HPUS]
    • POTASSIUM DICHROMATE [HSDB]
    • POTASSIUM DICHROMATE [VANDF]
    • Tox21_111009
    • Tox21_202307
    • Potassium dichromate, puriss., 99%
    • POTASSIUM DICHROMATE [WHO-DD]
    • AKOS024418771
    • POTASSIUM DICHROMATE(VI) [MI]
    • Potassium dichromate, AR, >=99.9%
    • Potassium dichromate, LR, >=99.5%
    • NCGC00090755-01
    • NCGC00259856-01
    • DIPOTASSIUM BICHROMATE (K2CR2O7)
    • DIPOTASSIUM DICHROMATE (K2CR2O7)
    • PD077496
    • Potassium dichromate, BioXtra, >=99.5%
    • NS00080655
    • Potassium dichromate, ACS reagent, >=99.0%
    • Potassium dichromate, BioUltra, >=99.5% (RT)
    • Potassium dichromate, ReagentPlus(R), >=99.5%
    • Chromic acid (H2Cr2O7), potassium salt (1:2)
    • Potassium dichromate, 99.99% trace metals basis
    • Potassium dichromate, SAJ first grade, >=99.5%
    • Q239729
    • Potassium dichromate, JIS special grade, >=99.5%
    • Potassium dichromate, Yanagishima Pharmaceutical Co. Ltd.
    • Potassium dichromate, NIST(R) SRM(R) 136f, oxidimetric standard
    • Potassium dichromate, NIST(R) SRM(R) 935a, UV absorbance standard
    • Potassium dichromate, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., >=99.8%
    • 231-906-6
    • Potassium dichromate, certified reference material for titrimetry, certified by BAM according to ISO 17025, >=99.5%

  • Applications

    Potassium dichromate (CAS 7778-50-9) is a strong oxidizer with several industrial applications. In analytical chemistry, it serves as a standard oxidant for redox titrations (notably iron(II) determinations in acidic media) and in water-quality analyses. In metal finishing, it participates in forming chromate conversion coatings on steel, aluminum, and zinc alloys to enhance corrosion resistance. In coatings and primers, chromate-containing formulations may use dichromate to improve adhesion and corrosion protection of metal substrates. It is also employed in cleaning and surface-preparation solutions for metals and in glass and ceramic etching processes. At the process scale, it functions as an oxidizing agent in organic synthesis and as an intermediate in chemical manufacturing, under appropriate safety controls and regulatory compliance.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 704.04
    methanol 1168.92
    isopropanol 597.44
    water 887.16
    ethyl acetate 233.8
    n-propanol 475.32
    acetone 510.44
    n-butanol 405.9
    acetonitrile 339.2
    DMF 1529.93
    toluene 90.05
    isobutanol 327.59
    1,4-dioxane 390.07
    methyl acetate 248.0
    THF 957.78
    2-butanone 296.71
    n-pentanol 252.0
    sec-butanol 423.94
    n-hexane 55.51
    ethylene glycol 520.59
    NMP 662.3
    cyclohexane 41.86
    DMSO 1291.04
    n-butyl acetate 106.13
    n-octanol 152.28
    chloroform 294.92
    n-propyl acetate 159.16
    acetic acid 276.44
    dichloromethane 306.77
    cyclohexanone 182.26
    propylene glycol 465.63
    isopropyl acetate 182.44
    DMAc 968.17
    2-ethoxyethanol 602.21
    isopentanol 281.91
    n-heptane 47.02
    ethyl formate 246.15
    1,2-dichloroethane 228.53
    n-hexanol 208.88
    2-methoxyethanol 1136.86
    isobutyl acetate 89.89
    tetrachloromethane 99.84
    n-pentyl acetate 91.81
    transcutol 321.35
    n-heptanol 150.78
    ethylbenzene 56.53
    MIBK 214.8
    2-propoxyethanol 522.73
    tert-butanol 623.64
    MTBE 283.29
    2-butoxyethanol 289.63
    propionic acid 222.79
    o-xylene 88.47
    formic acid 479.13
    diethyl ether 432.0
    m-xylene 95.72
    p-xylene 56.21
    chlorobenzene 60.4
    dimethyl carbonate 341.31
    n-octane 25.0
    formamide 736.27
    cyclopentanone 387.08
    2-pentanone 318.01
    anisole 183.99
    cyclopentyl methyl ether 430.13
    gamma-butyrolactone 410.24
    1-methoxy-2-propanol 962.49
    pyridine 188.68
    3-pentanone 242.57
    furfural 326.37
    n-dodecane 19.94
    diethylene glycol 566.84
    diisopropyl ether 145.53
    tert-amyl alcohol 423.09
    acetylacetone 267.72
    n-hexadecane 20.35
    acetophenone 143.21
    methyl propionate 325.6
    isopentyl acetate 79.55
    trichloroethylene 207.58
    n-nonanol 134.99
    cyclohexanol 245.68
    benzyl alcohol 161.31
    2-ethylhexanol 107.75
    isooctanol 109.15
    dipropyl ether 186.44
    1,2-dichlorobenzene 66.45
    ethyl lactate 207.11
    propylene carbonate 218.22
    n-methylformamide 779.92
    2-pentanol 355.44
    n-pentane 97.72
    1-propoxy-2-propanol 337.2
    1-methoxy-2-propyl acetate 191.54
    2-(2-methoxypropoxy) propanol 214.85
    mesitylene 74.5
    ε-caprolactone 176.81
    p-cymene 52.07
    epichlorohydrin 457.6
    1,1,1-trichloroethane 144.38
    2-aminoethanol 654.93
    morpholine-4-carbaldehyde 568.13
    sulfolane 488.12
    2,2,4-trimethylpentane 35.06
    2-methyltetrahydrofuran 412.24
    n-hexyl acetate 117.98
    isooctane 31.45
    2-(2-butoxyethoxy)ethanol 257.23
    sec-butyl acetate 106.48
    tert-butyl acetate 194.39
    decalin 23.34
    glycerin 659.23
    diglyme 383.7
    acrylic acid 207.1
    isopropyl myristate 66.56
    n-butyric acid 233.01
    acetyl acetate 118.99
    di(2-ethylhexyl) phthalate 65.01
    ethyl propionate 196.61
    nitromethane 481.76
    1,2-diethoxyethane 153.57
    benzonitrile 100.51
    trioctyl phosphate 68.02
    1-bromopropane 183.21
    gamma-valerolactone 377.82
    n-decanol 107.11
    triethyl phosphate 87.24
    4-methyl-2-pentanol 197.48
    propionitrile 259.82
    vinylene carbonate 175.9
    1,1,2-trichlorotrifluoroethane 364.99
    DMS 106.19
    cumene 50.02
    2-octanol 121.26
    2-hexanone 175.43
    octyl acetate 88.13
    limonene 68.76
    1,2-dimethoxyethane 677.45
    ethyl orthosilicate 86.45
    tributyl phosphate 64.86
    diacetone alcohol 326.44
    N,N-dimethylaniline 196.55
    acrylonitrile 274.81
    aniline 187.69
    1,3-propanediol 550.58
    bromobenzene 48.36
    dibromomethane 221.88
    1,1,2,2-tetrachloroethane 248.47
    2-methyl-cyclohexyl acetate 91.75
    tetrabutyl urea 108.29
    diisobutyl methanol 82.6
    2-phenylethanol 140.16
    styrene 56.91
    dioctyl adipate 83.2
    dimethyl sulfate 453.29
    ethyl butyrate 119.2
    methyl lactate 382.27
    butyl lactate 115.62
    diethyl carbonate 91.06
    propanediol butyl ether 232.66
    triethyl orthoformate 107.03
    p-tert-butyltoluene 61.08
    methyl 4-tert-butylbenzoate 155.16
    morpholine 539.42
    tert-butylamine 409.57
    n-dodecanol 86.2
    dimethoxymethane 1288.41
    ethylene carbonate 164.46
    cyrene 266.92
    2-ethoxyethyl acetate 112.57
    2-ethylhexyl acetate 64.03
    1,2,4-trichlorobenzene 76.7
    4-methylpyridine 185.58
    dibutyl ether 89.38
    2,6-dimethyl-4-heptanol 82.6
    DEF 436.17
    dimethyl isosorbide 307.23
    tetrachloroethylene 169.3
    eugenol 196.4
    triacetin 112.81
    span 80 167.85
    1,4-butanediol 265.59
    1,1-dichloroethane 216.11
    2-methyl-1-pentanol 174.62
    methyl formate 533.1
    2-methyl-1-butanol 283.06
    n-decane 29.65
    butyronitrile 226.09
    3,7-dimethyl-1-octanol 104.94
    1-chlorooctane 69.56
    1-chlorotetradecane 34.28
    n-nonane 29.57
    undecane 23.72
    tert-butylcyclohexane 25.97
    cyclooctane 27.03
    cyclopentanol 353.3
    tetrahydropyran 289.94
    tert-amyl methyl ether 289.53
    2,5,8-trioxanonane 305.14
    1-hexene 104.87
    2-isopropoxyethanol 380.54
    2,2,2-trifluoroethanol 285.62
    methyl butyrate 205.66

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction